AVENGERS ENDGAME is the subject of much speculation and fan theories. This one features a particularly beloved character from the X-men universe...

Avengers: Endgame will close the chapter on Phase III of the Marvel Cinematic Universe and with half of the heroes lives' hanging in the balance, fans are looking to Avengers 4 with keen eyes. There are still four months until Avengers: Endgame is in cinemas, and with plenty of time to speculate, all sorts of fan theories have sprouted up. A new theory put forward by FandomWire takes the future of the MCU in a whole new direction...

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Avengers Endgame: Wolverine may cameo but it is unlikely given the Disney-Fox merger is not finished (Image: Fox/Marvel)

Marvel is known for last minute additions and reshoots, so a quickly filmed cameo is possible, if improbable.

There are very few details available about the upcoming Avengers movie.

The only plot synopsis available so far is taken from the trailer, which reads: "Adrift in space with no food or water, Tony Stark sends a message to Pepper Potts as his oxygen supply starts to dwindle.

"Meanwhile, the remaining Avengers -- Thor, Black Widow, Captain America and Bruce Banner -- must figure out a way to bring back their vanquished allies for an epic showdown with Thanos -- the evil demigod who decimated the planet and the universe."